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Luxurious sound from Polk's gorgeous, flagship floor-standing speaker

Immerse yourself in smooth, high-end sound that envelops and caresses you thanks to Polk's LSi M 707. Building upon the widely acclaimed LSi family of speakers, the new LSi M series incorporates the latest developments in speaker technology, fitted into a newly designed enclosure that's beautifully sculpted and luxuriously finished. You'll hear a wide, deep soundstage with realistic imaging fleshed out in pinpoint detail, and anchored by effortlessly deep bass. It'll faithfully reproduce your most demanding audio sources from top to bottom, without any help from a separate subwoofer. It makes an excellent pair in a stereo music setup or becomes the shining star in a knock-out home theater system.

Polk's Dynamic Sonic Engine: The speaker within a speaker

An exploded view of the Dynamic Sonic Engine with the tweeter and midrange at the top of the speaker.

The heart of the LSi M 707 is Polk's Dynamic Sonic Engine. Made up of a 3-1/4" midrange driver and a 1" ring radiator tweeter in its own acoustically sealed enclosure, this tightly spaced duo acts like a "mini-monitor." The precise alignment of the midrange and tweeter allows them to disperse sound over a wide, uniform area with excellent off-axis response in the critical 200 Hz to 2,000 Hz midrange.

The ring radiator tweeter features several improvements from the version in the earlier LSi line. A slight reshaping of the tweeter's bullet-shaped phase plug allows it to move even farther out of the baffle, while a redesigned diaphragm has made the tweeter even more efficient. It even has its own tuned enclosure within the Dynamic Sonic Engine. These changes result in higher power handling, extended dynamic range, improved dispersion, and extended high-frequency response  all the way up to 30,000 Hz!

Advanced driver material for even more realistic sound

The original LSi speakers featured a light, stiff mineral-filled polypropylene cone that was "puffed up" with injected air to form a honeycomb-like structure. The new super cell aerated polypropylene uses larger "puffed cells" to create a cone material that's thicker yet lighter than the original. It's used in both the midrange and midbass drivers, as well as both woofers, allowing them to move faster and with more efficiency.

Dual woofers deliver smooth, effortless bass

Low on the '707's front baffle you'll notice dual 6" x 9" woofers. The oval shape helps them produce tight low-frequency music and movie sounds while maintaining a narrow cabinet width. Plus, each woofer has its own PowerPort®  a unique Polk design that positions specially designed "cones" at the mouth of the bass ports to direct moving air to eliminate bass-stealing turbulence. No turbulence means no wasted power, which means more efficient bass response.

Four-way design for clear, low-distortion sound

The LSi M 707 features a 4-way design, meaning that the tweeter handles only the highest of frequencies, the midrange handles the middle frequencies, the midbass handles the mid to low frequencies, and the woofers handle only the lowest frequencies. This separation allows each driver to perform within its optimum range, meaning you'll hear sound with absolute clarity and stunning impact. And this speaker uses proprietary Orth Crossovers, making it extremely efficient and easier for your receiver or amplifier to drive.

Careful cabinet design with a stunning real wood veneer

The '707 cabinet is made of heavily braced 3/4" thick MDF with an even thicker front baffle (1-1/4") to keep distortion to a minimum. Each driver has its own separate, non-parallel chamber to increase the efficiency of each driver and eliminate internal resonances and standing waves. Dual gold-plated binding posts let you bi-amp or bi-wire this speaker for even better performance. The magnetic grille easily snaps on and off, and it measures less than 1mm thick, so it won't interfere with the sound. And finally, the curved cabinet is finished with a furniture-grade, real-wood veneer that's hand-polished to achieve a gorgeous glow in your home.

Achieve startling realism and seamless surround effects when you build a complete LSi M system. All LSi M models feature the same components and tuning, so you can create any combination of towers in the front of your room with a center channel speaker for crisp dialogue, and either bookshelf speakers or dedicated surround speakers in the back of your room for wraparound sound effects.

Floor-standing speakers  still standing tall

Sure, floor-standing tower speakers buck the industry trend toward smaller, visually inconspicuous speakers, but they're hard to beat if great sound is your primary goal. Tower speakers produce powerful sound with excellent bass, making them a great choice for serious music lovers and for folks who want high-impact home theater.

Product Research

Driver Technology

Performance Objectives of the Polk Audio LSiM Series Loudspeakers: The
LSiM series loudspeaker is Polk Audio's best high-performance loudspeaker. Polk
Audio designed the LSiM series loudspeakers to create a sound that virtually
transports you to the scene of the recorded performance. It was engineered &
created with the following performance objectives in mind.

Pleasing tonality, even during extended listening at
performance levels.

Enhanced Ring Radiator Tweeter: The ring radiator tweeter
was a vital element in the success of Polk Audio's original LSi Series. Polk
Audio engineers have made some nuanced improvements in the design of this
tweeter. First, they reshaped the tweeter's bullet-shaped phase plug, allowing
it to move farther out of the baffle, improving dispersion and eliminating
horn-loading. Next, they opened up the tweeter's face-plate, then redesigned the
tweeter's diaphragm roll to make it more efficient and improve dispersion even
more. Finally, they gave the new ring radiator tweeter its own tuned enclosure
(Dynamic Sonic Engine). This new ring radiator tweeter boasts higher power
handling, extended dynamic range, improved dispersion and extended top-end
response.

Super Cell Aerated Polypropylene (APP) Cone Woofer: If the
perfect cone material is lightweight (for faster, more efficient action) and
stiff (for less distortion-causing flex), with enough internal damping to
suppress and offset any limitations of its lightweight stiffness, then the Super
Cell APP Cone Material is about as perfect as cone material gets. Aerated
Polypropylene (APP) is a mineral-filled polypropylene material that's been
"puffed up" with injected air to form a honey-comb structure. Polk Audio's
original APP cone approached the ideal balance of lightweight stiffness with
high damping, along with good resistance to moisture, UV and temperature
extremes. Next generation LSiM series loudspeakers employ Polk Audio's next
generation of APP Super Cell. In Super Cell APP, the "puffed cells" are larger,
for a thicker cone material that actually has less mass than the original APP
material. Super Cell APP has larger cells, for lighter weight and more inherent
damping, plus uncompromised stiffness, for unsurpassed transient response and
resonance suppression.

Enhanced Voice Coils: Allowing lots of
movement in a limited space, ELM Voice Coils power the LSiM series speaker's
mid-range & mid-woofer drivers to extend their higher-frequency response with
much less impedance. The LSiM subwoofer drivers use Overhung Voice Coils, which
allow the larger excursions and greater power handling necessary for big
subwoofer performance.

Enclosure Design

MDF Enclosure: The enclosure is an integral part of the
sound design of the Polk Audio LSiM series loudspeaker. All LSiM cabinets are
made of .75" MDF, with wide-radius baffles of robust 1.25" MDF. Substantial
internal bracing (each driver has its own separate non-parallel chamber)
increases efficiency and banishes internal resonances & standing waves, for high
power handling and incredible smoothness. Wide-radius baffles, along with
zero-diffraction magnetic grilles, help stabilize imaging for a very wide,
well-defined soundstage.

Dynamic Sonic Engine (DSE): At the heart of the Polk Audio
LSiM series floor-standing loudspeaker is an enclosure-within-the-enclosure design
(known as the Dynamic Sonic Engine) that houses the mid-range driver & the ring
radiator tweeter. Molded into one rigid piece, the DSE enclosure tapers to a
"turbine" that reduces back-wave reflections. The DSE combines its two speakers
in an aligned, optimized array for wide, uniform dispersion in the critical
200Hz-2kHz midrange, improving transient response. The combination delivers
exact timbre-matching, improved high-frequency dispersion and greater horizontal
off-axis response.

Note: The ring radiator tweeter, midrange driver, &
midbass woofer are
housed in a separate internal sealed enclosure from the ported enclosure
which houses the two oval subwoofer drivers.

PowerPort Bass Venting: PowerPort Bass Venting is a Patented
Polk Audio technology that uses a specially designed "cone" at the mouth of the
bass port to direct moving air as it exits the port. Air moving out of a bass
port creates turbulence, which can result in boomy distortion & "port noise",
especially at high volume. This distortion can cause bass output losses up to
3dB, wasting lots of amp power. To eliminate bass-stealing turbulence at the
mouth of the port, Polk Audio engineers designed the PowerPort. It's unique
shape promotes "laminar" airflow even in short tube ports by mimicking the
properties of longer, flared port openings. No turbulence means no wasted power,
which means more efficient bass response.

Bi-Wiring/Bi-Amping: Using the dual posts, you can bi-wire
or bi-amp the speaker. Bi-wiring or bi-amping the speaker provides improved bass
& treble performance. If you decide to bi-wire or bi-amp, you must remove the
jumpers between the terminal posts (failure to do this could result in damage to
your amplifier and loudspeakers).

Bi-Wiring: Bi-wiring can provide noticeable
improvements in the overall transparency of your loudspeakers. Run separate
speaker wires to the low & high frequency drivers from a single amplifier
(the upper set of binding posts are for the high frequency drivers; the
lower set of binding posts are for the low frequency drivers).

Bi-Amping: Bi-amping allows you to use separate
amplifiers for the high & low frequency sections of your loudspeaker for
greater dynamic range & lower distortion. We recommend that your separate
amplifiers have identical gain to preserve the speaker's voicing balance.

Mounting Options

Placement: To enjoy the most realistic stereo image and lifelike
sound, place the floor-standing speakers so that an equilateral triangle is
created between the speakers & your favorite listening position. Angle the
speakers toward the middle as necessary in order to support a more solid center
image. Experiment with the distance between your speakers & both the back/side
walls. You'll experience some bass boost with the speakers located closer to
walls.

Spiked Feet: The floor-standing speaker includes 4 pre-installed
adjustable spiked feet. These adjustable spiked feet allow you to tilt the
speaker backwards or forward a tiny bit in order to optimize your listening
area. Most floor-standing speakers are adjustable only from the bottom of
the base & require you to tip the speaker over using two hands to access
the floor spikes. The LSiM floor spikes are adjustable from the top of the
base using the included 5mm hex (Allen) wrench.

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Great experience Polk Audio LsiM707

Written By rickybobby, Crown Point, IN on Sunday, December 14, 2014

I currently run a 7.2 Emotiva UMC-200 preamp and a Emotiva XPA-2 & XPA-5 and purchased the new Polk Audio LsiM707 tower speakers the Polk Audio LsiM703 bookshelf speakers 4 of the 703's and the Polk LsiM706c all in midnight mahogany and I am smitten kittens ( blown away ) at the quality of these speakers and not to mention the beautiful sound they emit! For instance when I am listening to them in 2 channel mode it feels like the rest of my speakers are still on. The 2 707's alone fill the room with magic you are just submerged in every little detail of the music just close your eyes and you feel the music they play imagin is perfect the midrange drivers do a wonderful job I would have to say that they take a good 100 hrs to break in. Also have 2 Polk Audio DSWPRO-660i on bass duty

Pros:I love these speakers, I could have bought Bowers & Wilkins 802 Nautilus but they were harsh on the ears I can listen to the Polk Audio LsiM707's and the rest of my LsiM series of speakers for hours without any fatigue on the ears. I listened to a lot of Expensive Speakers costing more than 5 times than that of the Polk LsiM series but none of them could beat the polk's with the LsiM707 not 1 thing stood out everything stood out and that's how I like it that is a true audiophiles speaker.

Cons:No other speaker has a chance in and around the $10,000.-$15,000 range because once you hear the LsiM707 speakers with a good power amplifier you would realize that Polk hands down built one of the best all around audiophile speakers and the rest of the other brands is just wasted cash. I'm not saying that the other brands I heard aren't good but it's like they would only stand out in one area mids highs but not in the bottom end . And that's exactly what Polk did by building there LsiM series

Polk Audio LSI M707 Floor Speaker

Written By William P., Naples, FL on Thursday, August 28, 2014

I bought the M707's with the intention of not having to purchase another set of lead speakers for myself again for many many years - if ever again. These speakers each composed of five powered speaker cones/woofers require a lot of power. I am currently powering mine with a 70 W per channel, well reviewed, tube amplifier which I've only had since I bought the speakers. I may keep the tube amplifier for other purposes in the future and purchase a pair of "Mono blocks" to power these babies. They sound good now - knowing that my current main limitation is the acoustics of my room and possibly an under powering amp. They certainly need to breath and have a lot of clean power backing them up to perform as designed - I'm sure. Also I think space to pull them out away from the front wall helps their sound so consider this also - basically you need a lot of space. But that is certainly a consideration for any speakers at this level of power and consumer expectations. That being said, I just love them. They look great, don't distort at all at any power level I able to give them, and hit all phases and frequencies well. Of course you may want to have some kind of equalization to be sure the tones fit your listening preferences.

Pros:Pros include a huge appetite for whatever you throw at them. The ability to bi-amp the speakers. Super high-quality furniture finish and construction, and extremely thin magnetic grill and covering that looks fantastic and can easily be removed and replaced with no damage to the cover or speakers, and of course a well - documented and respected track record, engineering, and production history for decades by Polk Audio. Not to mention a fantastic full five year warranty.

Cons:So far the only con I can come up with for the speakers is the fact that I probably could supply a better power source for them. Otherwise most likely I would've given five stars.

Polk Audio LSIm707

Have owned several higher end speakers over the years and these are just about the best, especially at this price point. Sparkling highs, realistic mid-range voice; solid, tight bass--can momentarily be a bit boomy lower-mid range on some material, but tweaking speaker location helps put an end to that. These speakers present a great soundstage with a great sense of space and openess around each individual sound--they also seem to be able to very competently present every detail and nuance of the program material without losing small soft details to louder sounds that occur simultaneoously. Sound surprisingly good even at lower volume settings for such large speakers and have tremendous dynamic range---you will need quite a bit of power to drive these, especially at higher volume settings. Appear to be an outstanding value for the money and are not only great to listen to but pleasing to look at.

Pros:Great look--great sound

Cons:Not really a dislike--but be prepared--these are large, heavy speakers--not easy to move them about to tweak the sound, especially on a carpeted surface